scholarly journals Yield Response to Foliar Fungicide Application in Winter Wheat

10.5772/25716 ◽  
2012 ◽  
Author(s):  
Stephen Wegulo ◽  
Julie Stevens ◽  
Michael Zwingman ◽  
P. Stephen
Keyword(s):  
Winter Wheat ◽  
Yield Response ◽  
Fungicide Application ◽  
Foliar Fungicide

scholarly journals Winter Wheat Grain Yield Response to Fungicide Application is Influenced by Cultivar and Rainfall

2019 ◽  
Vol 35 (1) ◽  
pp. 63-70
Author(s):  
Emmanuel Byamukama ◽  
Shaukat Ali ◽  
Jonathan Kleinjan ◽  
Dalitso N. Yabwalo ◽  
Christopher Graham ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Grain Yield ◽  
Yield Response ◽  
Wheat Grain ◽  
Fungicide Application

scholarly journals Impact of Powdery Mildew and Leaf Rust on Milling and Baking Quality of Soft Red Winter Wheat

Plant Disease ◽  
2001 ◽  
Vol 85 (4) ◽  
pp. 423-429 ◽  
Author(s):  
Kathryne L. Everts ◽  
Steven Leath ◽  
Patrick L. Finney
Keyword(s):  
Powdery Mildew ◽  
Winter Wheat ◽  
Leaf Rust ◽  
Fungicide Application ◽  
Baking Quality ◽  
Soft Red Winter Wheat ◽  
Flour Yield ◽  
Foliar Fungicide ◽  
Red Winter Wheat ◽  
The Relationship

Changes in milling and baking quality (especially flour yield) of soft red winter wheat can have a large economic impact on flour mills. To determine the relationship between early-season powdery mildew and late-season leaf rust on flour yield, flour protein, alkaline water retention capacity, and kernel texture (softness equivalent), a study was conducted over 2 years at Kinston and Plymouth, NC. Different levels of powdery mildew and leaf rust developed on three winter wheat cultivars that varied in levels of disease resistance, the presence of seed treatment, and the presence and timing of foliar fungicide application. In Kinston and Plymouth in 1989-90, where leaf rust occurred early, the softness equivalent score was lower in wheat grown from seed treated with triadimenol. The following year, when the leaf rust epidemic increased later, foliar fungicide application reduced disease and resulted in lower softness equivalent scores in both Plymouth and Kinston for cv. Saluda and in Kinston for cv. Coker 983. A regression model was developed to describe the relationship between the log of the area under the disease progress curves and adjusted flour yield (AFY). The AFY of Saluda was reduced in the presence of powdery mildew such that %AFY = 103.96 - 0.92 (log AUMPC).

scholarly journals Cultivar response to fungicide application in relation to rice blast control, productivity and sustainability

2003 ◽  
Vol 38 (1) ◽  
pp. 11-17 ◽  
Author(s):  
Anne Sitarama Prabhu ◽  
Marta Cristina Filippi ◽  
Francisco José Pfeilsticker Zimmermann
Keyword(s):  
Grain Yield ◽  
Rice Blast ◽  
Field Trials ◽  
Yield Response ◽  
Fungicide Treatment ◽  
Fungicide Application ◽  
Progress Curve ◽  
Panicle Blast ◽  
Sustainable Value ◽  
Foliar Fungicide

Four field trials were conducted, from 1995 to 1997, with the objective of studying the response of four upland cultivars to foliar fungicide application in relation to panicle blast control, grain yield and sustainability. Differential disease control and yield response of cultivars to fungicide treatment were obtained. Losses in grain yield of cultivars IAC 202, Caiapó, Rio Paranaíba and Araguaia due to panicle blast were 44.8%, 27.4%, 24.4% and 18.2%, respectively. Two applications of tricyclazole or benomyl controlled panicle blast, as indicated by lower values of disease progress curve and relative panicle blast severity, and increased grain yield of the cultivar IAC 202. The losses in 100 panicle grain weight and grain yield were significantly reduced by 22.3% and 25.1% in IAC 202 and 23.6% and 20.5% in Caiapó, respectively, with two sprays of tricyclazole. Sustainable value index for yield was maximum with two applications of tricyclazole (0.59), followed by one application at booting (0.46) and at heading (0.40) in cultivar IAC 202. Results showed no yield response of the cultivars Rio Paranaíba and Araguaia to fungicide applications for panicle blast control.

Corn, Soybean, and Wheat Yield Response to Crop Rotation, Nitrogen Rates, and Foliar Fungicide Application

Crop Science ◽  
2017 ◽  
Vol 57 (2) ◽  
pp. 983-992 ◽  
Author(s):  
Spyridon Mourtzinis ◽  
David Marburger ◽  
John Gaska ◽  
Thierno Diallo ◽  
Joe G. Lauer ◽  
...  
Keyword(s):  
Crop Rotation ◽  
Wheat Yield ◽  
Yield Response ◽  
Fungicide Application ◽  
Nitrogen Rates ◽  
Foliar Fungicide

scholarly journals Multiple Mid-Atlantic Field Experiments Show No Economic Benefit to Fungicide Application When Fungal Disease Is Absent in Winter Wheat

2011 ◽  
Vol 101 (3) ◽  
pp. 323-333 ◽  
Author(s):  
Randy Weisz ◽  
Christina Cowger ◽  
Gaylon Ambrose ◽  
Andrew Gardner
Keyword(s):  
Winter Wheat ◽  
Economic Benefit ◽  
Field Experiments ◽  
Block Design ◽  
Fungal Disease ◽  
Yield Response ◽  
Cumulative Probability ◽  
Delayed Senescence ◽  
Yield Increase ◽  
Fungicide Application

Strobilurin fungicides produce intensified greening and delayed senescence in plants, and have been claimed to enhance yields of field crops in the absence of disease. To help evaluate this claim, available publicly sponsored tests of fungicides on soft red winter wheat in Virginia and North Carolina (n = 42) were analyzed for the period 1994 to 2010. All tests were replicated and had a randomized complete block, split-plot, or split-block design. Each test included 1 to 32 cultivars and one to five fungicides (two strobilurins, one triazole, and two strobilurin-triazole mixtures). There was a total of 311 test–cultivar–fungicide treatment comparisons, where a comparison was the reported yield difference between sprayed and unsprayed treatments of a given cultivar in a given test. Parameters used to calculate the economic benefit or loss associated with fungicide application included a grain price range of $73.49 to 257.21 Mg–1 ($2 to 7 bu–1), a total fungicide application cost of $24.71 to 74.13 ha–1 ($10 to 30 acre–1), and a 0.14 to 0.21 Mg ha–1 (2.3 to 3.4 bu acre–1) loss in yield from driving over wheat during application (with a sprayer 27.4 or 18.3 m [90 or 60 feet] wide, respectively). The yield increase needed to pay for a fungicide application at each combination of cost and price was calculated, and the cumulative probability function for the fungicide yield-response data was modeled. The model was used to predict the probability of achieving a break-even yield, and the probabilities were graphed against each cost–price combination. Tests were categorized as “no-disease” or “diseased” based on reports of the researchers rating the tests. Subsets of the data were analyzed to assess the profitability of the triazole fungicide and the strobilurin-containing fungicides separately in no-disease versus diseased experiments. From the results, it was concluded that, with routine fungicide application based solely on wheat growth stage, total fungicide application costs had to be <$24.71 ha–1 ($10 acre–1) in order to average a ≥50% probability of breaking even or making a profit (compared with not spraying). By contrast, if fungicides were applied when fungal disease was present, total application costs of ≤$47 ha–1 ($19 acre–1) for strobilurins and ≤$72 ha–1 ($29 acre–1) for propiconazole alone were associated with a ≥50% probability of breaking even or making a profit at a wheat price of $184 Mg–1. The results do not support the application of strobilurin or triazole fungicides to mid-Atlantic wheat crops for “plant health” in the absence of disease. Rather, they support basing the decision to apply fungicide on observation of disease, if an economic return for the input is desired.

scholarly journals Revisiting Fungicide-Based Management Guidelines for Leaf Blotch Diseases in Soft Red Winter Wheat

Plant Disease ◽  
2015 ◽  
Vol 99 (10) ◽  
pp. 1434-1444 ◽  
Author(s):  
K. T. Willyerd ◽  
C. A. Bradley ◽  
V. Chapara ◽  
S. P. Conley ◽  
P. D. Esker ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Flag Leaf ◽  
Analytical Models ◽  
Yield Response ◽  
Yield Data ◽  
Leaf Blotch ◽  
Yield Increase ◽  
Fungicide Application ◽  
Soft Red Winter Wheat ◽  
Red Winter Wheat

Standard foliar fungicide applications in wheat are usually made between flag leaf emergence (Feekes [FK] 8) and heading (FK10.5) to minimize damage to the flag leaf. However, over the last few years, new fungicide programs such as applications prior to FK8 and split half-rate applications have been implemented, although there are few data pertaining to the efficacy of these programs. Eight experiments were conducted in Illinois, Indiana, Ohio, and Wisconsin from 2010 to 2012 to compare new programs to standard FK8 and FK10 programs in terms of disease control and yield response. The programs evaluated consisted of single full-rate applications of 19% tebuconazole + 19% prothioconazole (Prosaro) or 23.6% pyraclostrobin (Headline) at FK5 (pseudostem strongly erected), FK8, or FK10, or split half rates at FK5 and 8 (FK5+8), plus an untreated check (CK). Leaf blotch (LB) severity and yield data were collected and random effects meta-analytical models fitted to estimate the overall log odds ratio of disease reaching the flag leaf ([Formula: see text]) and mean yield increase ([Formula: see text]) for each fungicide program relative to CK. For all programs, [Formula: see text] was significantly different from zero (P < 0.05). Based on estimated odds ratios (OR = exp[[Formula: see text]]), the two FK8 programs reduced the risk of LB reaching the flag leaf by 55 and 75%, compared with 62 and 69% and 67 and 70% for the two FK10 and FK5+8 programs, respectively, and only 32 and 37% for the two FK5 programs. [Formula: see text] was significantly different from zero (P ≤ 0.003) for all FK8, FK10, and FK5+8 programs, with values of 233 and 245, 175 and 220, and 175 and 187 kg ha−1 for the FK10, FK5+8, and FK8 programs, respectively. Differences in mean yield response between Headline and Prosaro were not statistically significant (P > 0.05). The probability of profitability was estimated for each program for a range of grain prices and fungicide application costs. All FK8, FK10, and FK5+8 programs had more than an 80% chance of resulting in a positive yield response, compared with 63 and 67% for the two FK5 programs. The chance of obtaining a yield increase of 200 kg ha−1, required to offset an application cost of $36 ha−1 at a grain price of $0.18 kg−1, ranged from 44 to 60% for FK8, FK10 and FK5+8 programs compared with 22 and 25% for the two FK5 programs. These findings could be used to help inform fungicide application decisions for LB diseases in soft red winter wheat.

scholarly journals Wheat Yield Response to Foliar Fungicide Application against Leaf Rust Caused by Puccinia triticina

2017 ◽  
Vol 7 (3) ◽  
Author(s):  
Krishna Dev Joshi ◽  
Ghulam Ullah ◽  
Attiq Ur Rehman ◽  
Muhammad Makky Javaid ◽  
Javed Ahmad ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Wheat Yield ◽  
Puccinia Triticina ◽  
Yield Response ◽  
Fungicide Application ◽  
Foliar Fungicide
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